IFM LMT01A Operating instructions

Operating instructions

Binary level sensor

LMT0xA

80301827 / 0005 / 2022

LMT0xA Binary level sensor

Contents

1 Preliminary note ............................................................. 3

1.1 Symbols used.......................................................... 3

1.2 Warnings used ......................................................... 3

2 Safety instructions............................................................ 4

3 Intended use................................................................ 5

3.1 Application area ........................................................ 5

3.2 Restriction of the application area........................................... 5

4 Function ................................................................... 6

4.1 Measuring principle...................................................... 6

4.2 Other features of the unit ................................................. 6

5 Installation.................................................................. 7

5.1 Installation location / environment........................................... 7

5.2 Application examples .................................................... 8

5.2.1 Unit types with short probe............................................ 8

5.2.2 Unit types with long probe............................................. 8

5.3 Notes on the use according to EHEDG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.4 Notes on the regulation (EC) 1935/2004 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

5.5 Installation procedure.................................................... 9

5.5.1 Installation LMT01A (hygiene-compliant) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

5.5.2 Installation LMT03A and LMT04A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

6 Electrical connection.......................................................... 12

7 Parameter setting............................................................ 13

7.1 IO-Link communication interface............................................ 13

7.2 Parameter setting using PC and USB IO-Link master . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

7.3 Parameter setting via memory plug.......................................... 13

7.4 Parameter setting during operation.......................................... 14

7.5 Parameters............................................................ 14

7.6 System commands...................................................... 14

7.7 Unit locking / data storage................................................. 15

7.8 Full adjustment via IO-Link................................................ 15

7.9 Parameter setting via the teach input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.9.1 Full adjustment via the teach input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

7.9.2 Changing the output function .......................................... 15

7.9.3 Fault during the teach operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

8 Operation .................................................................. 17

8.1 Switching states and LED indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

8.2 System events IO-Link ................................................... 17

9 Maintenance, repair and disposal................................................ 18

10 Factory setting .............................................................. 19

Binary level sensor LMT0xA

1 Preliminary note

You will find instructions, technical data, approvals and further information using the QR code on the

unit / packaging or at www.ifm.com.

1.1 Symbols used

Requirement

Instructions

Reaction, result

[...] Designation of keys, buttons or indications

Cross-reference

Important note

Non-compliance may result in malfunction or interference.

Information

Supplementary note

1.2 Warnings used

CAUTION

Warning of personal injury

wSlight reversible injuries may result.

LMT0xA Binary level sensor

2 Safety instructions

• The unit described is a subcomponent for integration into a system.

– The system architect is responsible for the safety of the system.

– The system architect undertakes to perform a risk assessment and to create documentation in

accordance with legal and normative requirements to be provided to the operator and user of

the system. This documentation must contain all necessary information and safety instructions

for the operator, the user and, if applicable, for any service personnel authorised by the

architect of the system.

• Please adhere to the notes on safe use in hazardous areas: Operating instructions (Ex protection

related part) for level sensors according to the EU directive 94/9/EC annex VIII (ATEX) group II,

equipment category 3D/3G.

• If no operating instructions (Ex protection related part) or EC declaration of conformity are supplied

with this product in the language of the EU user country, these can be requested from your dealer

(see delivery note) or manufacturer (see cover sheet / back).

• Only use the product for its intended purpose (Ò → Intended use).

• Only use the product for permissible media (Ò Technical data).

• If the operating instructions or the technical data are not adhered to, personal injury and/or damage

to property may occur.

• The manufacturer assumes no liability or warranty for any consequences caused by tampering with

the product or incorrect use by the operator.

• Installation, electrical connection, set-up, operation and maintenance of the product must be

carried out by qualified personnel authorised by the machine operator.

• Protect units and cables against damage.

Binary level sensor LMT0xA

3 Intended use

The unit monitors the level of liquid, viscous and powdery media in tanks and pipes. It can be used for

limit detection and run-dry protection. The separate setting of two switching thresholds enables the

detection of two different media (can be used, for example, for phase separation or differentiation of

media).

3.1 Application area

• Detection of almost all media.

• Food and hygienic areas.

• Available process connections: G1/2.

• Different probe lengths for various mounting positions and for temperature decoupling.

Type Factory setting1) Sensitivity1) Probe length2) Process connection

LMT01A Oils, greases, powders High 11 mm G1/2

LMT03A Oils, greases, powders High 153 mm G1/2

LMT04A Oils, greases, powders High 253 mm G1/2

1) Sensitivity adjustable (Ò Parameter setting)

2) Probe length measured from conical sealing edge (Ò Technical data)

3.2 Restriction of the application area

• Not suitable for abrasive media (e.g. quartz sand) and heavy bulk material.

• Not suitable for ozonised water.

• For use in aggressive media (acids and alkali):

uCheck the compatibility of the product materials beforehand (→ Technical data sheet).

• When used in media which are inhomogeneous, separate from each other thus forming separation

layers (e.g. oil layer on water):

uCheck the function by an application test.

• A large amount of air or gas bubbles may lead to changed switching characteristics. This effect can

be used to implement, for example, run-dry protection or pump protection (key word: cavitation).

uCheck the function by an application test. If required, adapt the sensitivity or set switching delays

(Ò Parameter setting).

• Do not expose the probe tip to intensive sun radiation (UV radiation).

LMT0xA Binary level sensor

4 Function

4.1 Measuring principle

Fig.1: Measuring principle

The unit operates on the impedance spectroscopy method. It analyses

the electrical behaviour of the media to be monitored in the frequency

range between 50 and 200 MHz. The probe tip generates an electrical

field that is influenced by the level. The nature of the medium as well as

build-up or foam have different electrical properties that are used for the

evaluation.

4.2 Other features of the unit

• Streamlined sensor geometry, no blockage of the pipe when unit types with short probe are used,

no pressure loss.

• Orientation-independent installation possible.

• Defined position of the cable entry for angled sockets when ifm welding adapters are used.

Binary level sensor LMT0xA

5 Installation

CAUTION

If the medium temperature is above 50 °C (122 °F) parts of the housing can increase in

temperature to over 65 °C (149 °F).

wRisk of burns

uDo not touch the unit.

uProtect the housing against contact with flammable substances and unintentional

contact.

uAllow the unit and process adapter to cool down before maintenance.

Before installing and removing the unit:

uMake sure that no pressure is applied to the system and there is no medium in the pipe or

tank. Also always take into account the potential dangers related to extreme machine and

medium temperatures.

The sensor is supplied without installation / connection accessories.

Only use accessories from ifm electronic gmbh! The optimum function is not ensured when

using components from other manufacturers.

Available accessories: www.ifm.com.

5.1 Installation location / environment

• Installation preferably in closed metal tanks or pipes.

• The sensor must be in electrical contact with the metal process connection.

When installed in plastic tanks, there may be deterioration caused by electromagnetic

interference.

uCheck the function by an application test.

uIf disturbances occur, appropriate measures must be taken (shielding, grounding, etc )

A correct fit and function of the unit and ingress resistance of the connection are only ensured

using ifm adapters.

When process connections from other manufacturers are used:

uEnsure mechanical compatibility.

wAs a rule, ifm does not assume any responsibility for ingress resistance, hygiene and

function, in particular with non-existing compatibility and incorrect installation.

15 mm

Fig.2: Sensor tip distances

When installed in restricted spaces (e.g. pipes, tank corners, structures)

or in agitators and other moving objects:

uTo avoid malfunction and damage on sensor and plant, adhere to a

distance of min. 15 mm to neighbouring objects (e.g. pipe/tank walls,

structures, other sensors), see fig. sensor tip distances.

LMT0xA Binary level sensor

5.2 Application examples

5.2.1 Unit types with short probe

Fig.3: Installation on a tank

Fig.4: Installation on a pipe

1: Installation position only suited to some extent

• Fig. installation on a tank: Possible installation positions in a tank (e.g. for point level detection or

as run-dry protection).

• Fig. installation on a pipe: Fill level monitoring in pipes.

With highly adhesive and viscous media and media prone to sedimentation or build-up the

installation positions (1) are only suitable to some extent. Residues might be detected as level.

5.2.2 Unit types with long probe

Installation from the top:

Fig.5: Installation from the top

A: Maximum level

Fig. installation from the top: For monitoring the maximum level (A) or as

overflow prevention. Different probe lengths enable different response

levels.

Lateral installation:

Fig.6: Lateral installation

Fig. lateral installation: Since the probe tip is installed further into the

tank, very adhesive and viscous residues can be suppressed.

Binary level sensor LMT0xA

The variable clamp fitting (accessory) allows variable installation of the unit types LMT03A and

LMT04A in height/installation depth. This enables, for example, a high-precision adjustment of

the response level. Moreover, these types can be uncoupled thermally from the process by

means of the variable clamp fitting (recessed installation of the sensor electronics). This also

allows applications with higher process temperature and/or with the risk of heat accumulation

(e.g. tank insulation).

5.3 Notes on the use according to EHEDG

The unit is suited for CIP (cleaning in process) when installed correctly.

uObserve the application limits (temperature and material resistance) according to the data

sheet.

uEnsure that the installation of the unit in the system complies with EHEDG guidelines.

uUse self-draining installation.

uOnly use process adapters permitted according to EHEDG with special seals required by the

EHEDG position paper.

The gasket of the system interface must not be in contact with the sealing point of the sensor.

uIn case of structures in a tank, the installation must be flush mount. If not possible then direct water

jet cleaning and cleaning of dead spaces must be possible.

uLeakage ports must be clearly visible and must be installed facing downwards for vertical pipes.

1: Leakage port

uTo avoid dead space adhere to the dimensions:

L<(D - d).

5.4 Notes on the regulation (EC) 1935/2004

The following components of the product are designed for permanent contact with food according to

the regulation (EC) 1935/2004:

– Sensor tip made of PEEK

– Sealing ring made of PEEK

– Sealing ring made of FKM (LMT03A / LMT04A)

5.5 Installation procedure

The unit is installed by means of an adapter:

LMT0xA Binary level sensor

uEnsure cleanliness of the sealing areas. Remove protective packaging only just before mounting.

In case of damaged sealing areas replace the unit or the adapter.

5.5.1 Installation LMT01A (hygiene-compliant)

The seal is formed by the flush front of the PEEK sealing cone (2).

uIf required: Slide the supplied seal (black O-ring), (1) over the thread onto the sensor and/or check

for correct position. It seals the gap on the back between the sensor and the adapter to protect

against the ingress of contamination in the thread area.

The seal between the housing and the process connection (1)

can compensate for variable insertion depths but not for the

system pressure.

1: Seal on the back (O-ring, black)

2: Sealing cone / sealing PEEK on metal

uIf required: Lightly grease the thread using a suitable lubricating paste which has been approved

for this application.

uScrew the sensor into the respective process connection and tighten it.

Maximum tightening torque: 20...25 Nm

uAfter installation check the tank / pipe for ingress resistance.

5.5.2 Installation LMT03A and LMT04A

The unit can be adapted for hygienic zero-leak via two sealing versions: Flush mount zero-leak using

metal-to-metal sealing (fig. LMT seal, metal-to-metal), or via insertion of an additional PEEK gasket

(fig. LMT seal, PEEK).

The PEEK sealing ring is not supplied with the unit. It can be ordered separately (E43323).

The PEEK sealing ring has been rated for ifm adapters with end stop towards the medium.

If the sealing between the housing and the process connection ((1) in fig. LMT seal, metal-to-

metal) is to withstand the system pressure, no end stop for the flush mount sealing area exists.

uIn this case, the PEEK sealing ring must not be used.

Flush mount hygienic zero-leak using metal-to-metal sealing (2):

Binary level sensor LMT0xA

Fig.7: LMT seal, metal-to-metal

1: Green flat seal

2: Metal sealing cone

uInsert the green flat seal (1) and/or check its position.

uIf required: Lightly grease the thread using a suitable lubricating paste which has been approved

for this application.

uScrew the sensor into the respective process connection and tighten it.

Maximum tightening torque: 20...25 Nm.

uAfter installation check the tank / pipe for ingress resistance.

Flush mount hygienic zero-leak using PEEK gasket (3):

Fig.8: LMT seal, PEEK.

1: Green flat seal

3: PEEK sealing ring beige (accessory E43323)

4: Black flat seal (E43323)

uIf needed, replace green flat seal (1) (on delivery) with black flat seal (4). The flat seal (4) is

supplied with the article E43323!

uSlide the PEEK sealing ring (3) onto the sensor tip until you feel the end stop (cone).

uIf required: Lightly grease the thread using a suitable lubricating paste which has been approved

for this application.

uScrew the sensor into the respective process connection and tighten it.

Maximum tightening torque: 20...25 Nm.

uAfter installation check the tank / pipe for ingress resistance.

LMT0xA Binary level sensor

6 Electrical connection

The device must be connected by a qualified electrician.

The national and international regulations for the installation of electrical equipment must be

adhered to.

Supply voltage SELV, PELV according to the technical data sheet.

uDisconnect power.

uConnect the unit as follows:

For marine applications (if approval available for the device), additional surge protection is

required.

Normal operation (factory setting):

1 BN

2 WH

4 BK

3 BU

OUT1

OUT2

L+

2 1

Teach operation:

1 BN

2 WH

4 BK

3 BU

OUT2

L+

2 1

Pin Core colours

1: BN brown

2: WH white

3: BU blue

4: BK black

OUT1:

• PNP / NPN switching output

• IO-Link

IN:

• Input for teach signal

OUT2:

• PNP / NPN switching signal

Colours to DIN EN 60947-5-2

Factory setting OUT1 and OUT2: PNP switching signal:

In the factory setting, the teach operation is deactivated.

uActivation: Ò Parameter setting via PC and IO-Link interface: [ou1] = [tch]

wOnly output OUT2 is available in the teach mode.

The connection accessories are not supplied with the unit. They can be ordered separately.

Binary level sensor LMT0xA

7 Parameter setting

With a suitable unit the presence of certain media can be detected while build-up or foam is

suppressed. In many cases the factory setting is sufficient. For special requirements it is possible to

adapt/configure the sensitivity and other functions to the corresponding application. Splashes, wave

movements and air bubbles can be suppressed, for example, by setting a switching delay.

The parameters can be set before installation and set-up of the unit or during operation.

If you change parameters during operation, this will influence the function of the plant.

uMake sure that there will be no malfunctions or dangerous operation in your plant.

uNote the potential dangers related to extreme plant conditions.

7.1 IO-Link communication interface

The device has an IO-Link communication interface which requires an IO-Link-capable module.

The IO-Link interface allows:

• direct access to process and diagnostic data,

• parameter setting of the unit outside the plant via the IO-Link interface,

• parameter setting of the unit via the IO-Link master during operation.

The IODDs necessary for the configuration of the unit, detailed information about process data

structure, diagnostic information, parameter addresses and the necessary information about the

required IO-Link hardware and software can be found at www.ifm.com.

7.2 Parameter setting using PC and USB IO-Link master

uPreparing the PC, software and master. Observe the Ò Operating instructions of the respective

units / software.

uConnect the unit to the USB IO-Link master (Ò Accessories).

uFollow the menu of the IO-Link software.

uSet the parameters; adjustable parameters(Ò Parameters).

uCheck if the unit has accepted the parameter settings. If necessary, read sensor again.

uRemove the USB IO-Link master and put the unit into operation.

7.3 Parameter setting via memory plug

Via a memory plug (Ò Accessories), a parameter set can be written/transferred to the unit.

The memory plug can also be used to save the current parameter setting of a unit and to transfer it to

other units of the same type.

uLoad suitable parameter set (e.g. using a PC) to the memory plug. Observe the (Ò Operating

instructions) of the memory plug.

uMake sure that the sensor has the original factory settings.

uConnect the memory plug between sensor and socket.

wWhen voltage is supplied, the parameter set is transferred from the memory plug to the sensor.

uRemove the memory plug and put the unit into operation.

LMT0xA Binary level sensor

7.4 Parameter setting during operation

uMake sure that the sensor is connected to an IO-Link-capable module (master).

uRead the sensor using suitable IO-Link software. Observe the Ò operating instructions of the

respective software.

uSet the parameters, adjustable parameters (Ò IODD Description).

uCheck if the unit has accepted the parameter settings. If necessary, read sensor again.

uCheck whether the unit operates correctly.

For further information, please refer to the IODD description (www.ifm.com) or to the context-specific

parameter descriptions of the used parameter setting software.

7.5 Parameters

Name Description

SP1 / SP2

rP1 / rP2

Set points [SP1] / [SP2] and reset points [rP1] / [rP2].

Important:

[SPx] must be higher than [rPx]. If [SPx] is set to a value below [rPx], this is rejected by the device software.

The values for [SPx] / [rPx] are set in per cent of the maximum process value. The process value is defined as

follows:

Process value in air = 0 %, process value in tap water = 100%

Setting range [SPx]: 4...98 %, step increment: 1 %

Setting range [rPx]: 2...96 %, step increment: 1 %, minimum hysteresis: 2 %

Reference values:

Aqueous / water-based media: SPx= 62%, rPx= 54%

Media with low water content: SPx= 35%, rPx= 29%

Oils, fats, powders: SPx= 8%, rPx= 5%

ou1 / ou2 [ou1] / [ou2]: output function for OUT1 / OUT2:

– [Hno]=hysteresis function/normally open

– [Hnc]=hysteresis function/normally closed

– [Fno] = window function / normally open

– [Fnc] = window function / normally closed

Parameter [ou1] also provides the option [tch]:

– [tch]= configure pin4 as input for the teach signal

FOU1 / FOU2 Behaviour of the outputs OUT1 / OUT2 in case of a fault:

– [OFF] = output opens in case of a fault (factory setting)

– [On] = output closes in case of a fault

dFo Delay time of the outputs in case of a fault:

Setting range 0...5 s, step increment 0.2s

dS1*) / dS2*)Switch-on delay for OUT1 / OUT2:

Setting range 0...10 s, step increment 0.2s

*) Parameter [dSx] is not available for LMT01A!

dr1 / dr2 Switch-off delay for OUT1 / OUT2:

Setting range 0…10s, step increment 0.2s

P-n Output polarity for the outputs (PnP or nPn)

7.6 System commands

tSP1 Teach switch point 1 to medium 1

• Full adjustment to medium 1 to be detected, automatically sets the switching thresholds SP1/rP1 for OUT1.

tSP2 Teach switch point 2 to medium 2

• Full adjustment to medium 2 to be detected, automatically sets the switching thresholds SP2/rP2 for OUT2.

rES Restore the factory setting

Binary level sensor LMT0xA

7.7 Unit locking / data storage

The IO-Link master stores all parameters of the connected sensor (data storage) if configured in the

master. When a sensor is replaced by a sensor of the same type, the parameters of the old sensor are

automatically written to the new sensor if configured in the master and if the sensor allows this. For

safety reasons the data storage can be refused by the sensor. Factory setting: [Open]

Data storage – [Open] = Unit allows parameter download from the master.

– [Locked] = Unit refuses parameter download from the master.

7.8 Full adjustment via IO-Link

Full adjustment enables optimum sensitivity of the unit to be set to the medium to be detected (build-

up and foam are suppressed):

uFill the tank/pipe.

uThe probe tip must be completely covered with the medium.

uExecute the system command [tSP1] or [tSP2].

wThe unit automatically sets the switching thresholds [SPx]/[rPx].

uCheck the function by an application test.

7.9 Parameter setting via the teach input

The teach input must be activated.

uThis requires previous configuration via IO-Link: Parameter [ou1] = [tch].

Output OUT2 must be configured as hysteresis function (Hnc or Hno). If the window function is

set, an error during teaching results (Ò Error during teaching).

Only output OUT2 is available in the teach mode. In the teach mode the LEDs indicate the

switching status of output OUT2.

7.9.1 Full adjustment via the teach input

uFill the tank until the probe tip is completely covered.

uApply Ub+ to pin 4 for > 2 ... < 5 s.

wLEDs flashing at 2 Hz.

wAfter teaching the LEDs are on for 2 s. Then the colours change to regular operating mode.

7.9.2 Changing the output function

Output OUT2 can be changed from "NC" (Hnc) to "NO" (Hno) and vice versa.

uApply Ub+ to pin 4 for > 5 ... < 10 s.

wLEDs are flashing, first with 2Hz, after 5s with a 1Hz double flashing.

wAfter the change the LEDs are on for 2 s. Then the colours change to regular operating mode.

wAfter the successful change, the LEDs are on as follows:

No medium detected LEDs=yellow (for Hnc) LEDs = green (for Hno)

Medium detected LEDs=green (for Hnc) LEDs=yellow (for Hno)

LMT0xA Binary level sensor

7.9.3 Fault during the teach operation

uFaulty teach operation

wTeach operation stopped

wLEDs are flashing green/yellow with 8 Hz.

wThe unit returns to the operating mode with unchanged settings.

Possible faults:

• Time error (teach time too long / too short).

• Internal sensor signal not clear.

• Wrong output function: (Ò Parameter setting via the teach input)

• Process value too low (<9%, e.g. for powders), SPx/rPx must be set manually (Ò Parameter

setting via PC and IO-Link interface).

Binary level sensor LMT0xA

8 Operation

After power-on the device is in the operating mode. It carries out its measurement and evaluation

functions and generates output signals according to the set parameters.

uCheck whether the unit operates correctly.

8.1 Switching states and LED indicators

The table shows the factory settings. In this state OUT1=Hno and OUT2=Hnc.

Operating status LEDs OUT1 OUT2

Unit ready for operation, no medium detected green OFF ON

Unit ready for operation, medium detected yellow on off

No operating voltage off off off

Short circuit output 1 flashing yellow - 1)

Short circuit output 2 flashing yellow 1) -

Error / failure - OFF OFF

Teach operation (Ò Full adjustment via the teach input) and (Ò Changing the

output function)

Fault during the teach operation LEDs are flashing green/yellow with 8Hz.

1) according to the level

The LEDs always indicate the switching status of output OUT1 (exception: teach operation (Ò

Parameter setting via the teach input)).

8.2 System events IO-Link

Code Type Description

20480 d / 50 00 h Error Hardware fault in the unit.

uReplace device

25376 d / 63 20 h Error Parameter error

uVerify the data sheet and the values

30480 d / 77 10 h Error Short circuit

uCheck the installation

36350 d / 8D FE h Warning Test event. Event appears by setting index 2 to value 240. Event disappears

by setting index 2 to value 241

36351 d / 8D FF h Warning Test event. Event appears by setting index 2 to value 242. Event disappears

by setting index 2 to value 243

LMT0xA Binary level sensor

9 Maintenance, repair and disposal

uCheck sensor tip at regular intervals for deposits and damage. Clean the unit if badly soiled. In

case of damage replace the unit.

uAfter removal and before reinstallation of the unit carefully clean the probe neck and the installation

slot – especially the sealing cone – with appropriate methods to ensure that the unit is resistant to

ingress and without dead space.

uIt is not possible to repair the unit.

uIn case of return shipment, ensure that the unit is free from soiling, especially from dangerous and

toxic substances.

uFor transport only use appropriate packaging to avoid damage of the unit.

uAfter use dispose of the device in an environmentally friendly way in accordance with the

applicable national regulations.

If the variable clamp fitting is used:

uCheck the correct position of the safety chain or the securing wire between the clamp fitting

and the sensor at regular intervals.

uReplace damaged parts.

Binary level sensor LMT0xA

10 Factory setting

LMT0xA User settings

SP1 8 %

rp1 5 %

ou1 Hno

SP2 8 %

rp2 5 %

ou2 Hnc

FOU1 OFF

FOU2 OFF

dS1*) 0.0

dS2*) 0.0

dr1 0.0

dr2 0.0

P-n PnP

dFo 0.0

Percentage values refer to the process value (Ò Parameter setting).

*) Parameters not available for LMT01A.

IFM LMT01A, LMT03A, LMT04A Operating instructions

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